A gas phase rust-proof bag for new energy battery package

Abstract

The utility model discloses a kind of gas-phase rustproof bags for new energy battery packaging, it is related to new energy battery packaging technical field, including rustproof bag body, the rustproof bag body is multilayer composite structure, and by inside and outside sequentially include inner contact layer, buffer isolation layer, nylon film, VCI gas-phase rustproof layer and anti-static shielding layer, the outermost layer of the rustproof bag body is provided with outer protective layer, the outer protective layer is sequentially provided with PE flexible protective layer, PA support layer and EVOH gas barrier core layer from inside and outside.The outer protective layer designed in the utility model is formed by three-layer co-extrusion process once, combined with the flexibility of PE flexible protective layer, the support of PA support layer and the gas barrier property of EVOH gas barrier core layer, this structure design makes that outer protective layer can resist external friction and scratch, and can also keep the stability of bag inner environment, provides all-round protection for new energy battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery packaging technology, specifically to a vapor phase rust-preventive bag for new energy battery packaging. Background Technology

[0002] Vapor phase corrosion inhibitor bags are used for packaging new energy batteries. They are a high-tech packaging product based on vapor phase corrosion inhibitor technology. The core of the product lies in the vapor phase corrosion inhibitor (VCI) contained in the bag. In a sealed environment, the VCI releases rust-preventing gaseous factors. These gaseous factors can diffuse and penetrate to the surface of the packaged new energy battery and adsorb onto it, forming a dense protective film layer that is only one molecule thick. This protective film layer can effectively isolate various factors that induce corrosion, such as moisture and oxygen, from contact with the battery surface, thereby cutting off the possibility of metal ions reacting with water and oxygen, and achieving the effect of rust prevention.

[0003] Existing vapor phase corrosion inhibitor bags mainly provide rust protection, but they are insufficient in terms of mechanical strength, wear resistance, and gas barrier properties. During transportation and storage, the packaging may be affected by friction, scratches, or gas penetration, leading to a decrease in rust prevention effect or damage to the battery. For example, in a vapor phase oxidation prevention packaging for battery cells disclosed in patent CN204368757U, although the corrugated box provides a certain degree of physical protection, the vapor phase corrosion inhibitor bag itself may not have sufficient mechanical strength and wear resistance to resist friction, scratches, or external impacts during transportation and storage, which may cause the vapor phase corrosion inhibitor bag to break, thereby affecting its rust prevention effect and even causing damage to the battery cells.

[0004] Therefore, it is necessary to invent a vapor phase rust-preventive bag for packaging new energy batteries to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a vapor phase rust-proof bag for packaging new energy batteries, which solves the problems of insufficient mechanical strength, wear resistance, and gas barrier properties.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a vapor phase rust-proof bag for packaging new energy batteries, comprising a rust-proof bag body, wherein the rust-proof bag body is a multi-layer composite structure, and from the inside out, it comprises an inner contact layer, a buffer isolation layer, a nylon film, a VCI vapor phase rust-proof layer, and an antistatic shielding layer, wherein a heat-reflective layer is provided on the outer side of the antistatic shielding layer, and the heat-reflective layer is a vacuum-metallized film, wherein the outermost layer of the rust-proof bag body is provided with an outer protective layer, wherein the outer protective layer comprises, from the inside out, a PE flexible protective layer, a PA support layer, and an EVOH gas barrier core layer.

[0007] Preferably, the corners of the rust-proof bag body are reinforced by hot pressing. Hot pressing can significantly improve the tear resistance and wear resistance of these parts, thereby extending the service life of the rust-proof bag.

[0008] Preferably, the inner contact layer and the buffer isolation layer are made into a composite film by hot-press co-extrusion process, so as to achieve a tight bond between the inner contact layer and the buffer isolation layer, forming a composite film with excellent buffering performance and contact protection function.

[0009] Preferably, a nylon film is provided on the outer side of the buffer isolation layer, and the buffer isolation layer and the nylon film are combined by a co-extrusion composite process to enhance the mechanical strength and wear resistance of the rust-proof bag.

[0010] Preferably, the VCI vapor phase corrosion inhibitor layer is applied to the nylon film through a coating process, and the VCI vapor phase corrosion inhibitor layer exists in the form of a film, directly adhering to the surface of the nylon film. By utilizing the VCI vapor phase corrosion inhibitor technology, a protective atmosphere is formed inside the rust-proof bag to inhibit metal corrosion.

[0011] Preferably, the inner contact layer is made of a composite material of low-density polyethylene and an anti-blocking agent to ensure that the inner contact layer has good flexibility and is non-corrosive, while preventing interlayer adhesion.

[0012] Preferably, the closed-cell foam material of the buffer isolation layer is cross-linked polyethylene foam, and its surface is treated with plasma to form an antistatic coating, thereby enhancing the buffer performance and antistatic capability of the buffer isolation layer.

[0013] Preferably, the PE flexible protective layer, PA support layer and EVOH gas barrier core layer are formed in one step by a three-layer co-extrusion process to form an outer protective layer with excellent flexibility, support and gas barrier properties.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0015] 1. The heat reflective layer designed in this utility model adopts a vacuum-plated aluminum film, which can reflect external heat and reduce the transfer of heat to the inside of the rust-proof bag, thereby maintaining the stability of the temperature inside the bag to a certain extent. This is of great significance for the safety of new energy batteries during storage and transportation, especially in high-temperature environments.

[0016] 2. The outer protective layer of this utility model is formed in one step through a three-layer co-extrusion process, combining the flexibility of the PE flexible protective layer, the support of the PA support layer, and the gas barrier properties of the EVOH gas barrier core layer. This structural design enables the outer protective layer to resist external friction and scratches while maintaining the stability of the internal environment of the bag, providing all-round protection for new energy batteries. This comprehensive protective performance significantly improves the durability and reliability of the rust-proof bag and extends the service life of the packaged new energy batteries. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a front view structural diagram of the cross-section of the rust-proof bag body of this utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the outer protective layer of this utility model in the event of an explosion.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Rust-proof bag body; 101. Inner contact layer; 102. Buffer isolation layer; 103. Nylon film; 104. VCI vapor phase rust prevention layer; 105. Antistatic shielding layer; 2. Heat reflective layer; 3. Outer protective layer; 301. PE flexible protective layer; 302. PA support layer; 303. EVOH gas barrier core layer. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] This utility model provides, for example Figure 1-3 The rust-preventive bag shown is for packaging new energy batteries and includes a rust-preventive bag body 1. The rust-preventive bag body 1 has a multi-layer composite structure and includes, from the inside out, an inner contact layer 101, a buffer isolation layer 102, a nylon film 103, a VCI vapor phase rust-preventive layer 104 and an antistatic shielding layer 105. A heat-reflective layer 2 is provided on the outside of the antistatic shielding layer 105, and the heat-reflective layer 2 is a vacuum-metallized film.

[0024] In this embodiment, high-strength nylon material is selected, and a nylon film 103 is made through stretching and shaping processes to enhance the mechanical strength and wear resistance of the rust-proof bag body 1, resisting external friction and scratches. At the same time, it serves as the base for the VCI vapor phase rust inhibitor layer 104, ensuring the uniform adhesion of the rust inhibitor layer. The VCI vapor phase rust inhibitor is dissolved in an appropriate solvent and uniformly applied to the surface of the nylon film 103 through a coating process to form the VCI vapor phase rust inhibitor layer 104, providing long-term rust protection for the battery. On the outside of the VCI vapor phase rust inhibitor layer 104, an antistatic material is deposited through a coating process to form an antistatic shielding layer 105, which effectively prevents the potential damage to the new energy battery caused by static electricity accumulation. It may also have a certain electromagnetic shielding function, protecting the battery from external electromagnetic interference. On the outside of the antistatic shielding layer 105, an aluminum layer is deposited on the film substrate through a vacuum aluminizing process to form a heat reflective layer 2. The high reflectivity of the aluminum layer reflects external heat, reducing the transfer of heat to the inside of the rust-proof bag body 1, thereby maintaining the stability of the bag's internal temperature to a certain extent.

[0025] The corners of the rust-proof bag body 1 are reinforced by hot pressing. The inner contact layer 101 and the buffer isolation layer 102 are made into a composite film by hot pressing co-extrusion process. A nylon film 103 is provided on the outside of the buffer isolation layer 102. The buffer isolation layer 102 and the nylon film 103 are combined by co-extrusion composite process. The VCI vapor phase rust inhibitor 104 is applied to the nylon film 103 by coating process. The VCI vapor phase rust inhibitor 104 exists in the form of a film and is directly attached to the surface of the nylon film 103. The material of the inner contact layer 101 is a composite material of low-density polyethylene LDPE and anti-adhesion agent. The closed-cell foam material of the buffer isolation layer 102 is cross-linked polyethylene foam, and its surface is treated by plasma to form an antistatic coating.

[0026] In this embodiment, during the manufacturing process of the rust-proof bag body 1, a hot-pressing device is used to hot-press the corners of the bag body, making the materials tightly bonded and forming a reinforced structure, which significantly improves the tear resistance and wear resistance of the corners. Meanwhile, a composite film is made by hot-pressing co-extrusion of the inner contact layer 101 (a composite material of low-density polyethylene LDPE and an anti-adhesion agent) and the cross-linked polyethylene foam buffer layer 102, achieving a tight bond between the inner contact layer 101 and the buffer layer 102, forming a composite film with excellent cushioning performance and contact protection function. The inner contact layer 101 ensures that it is non-corrosive and flexible when in direct contact with the battery, while the buffer isolation layer 102 provides cushioning protection to prevent the battery from being damaged by impact during transportation. The pre-made buffer isolation layer 102 is combined with the nylon film 103 through a co-extrusion composite process to enhance the mechanical strength and wear resistance of the rust-proof bag body 1. Furthermore, by utilizing VCI vapor phase corrosion prevention technology, a protective atmosphere is formed inside the rust-proof bag body 1 to inhibit metal corrosion and prevent the battery from contacting harmful substances such as oxygen and moisture in the air, thereby achieving the purpose of rust prevention.

[0027] The outermost layer of the rust-proof bag body 1 is provided with an outer protective layer 3. The outer protective layer 3 is provided with a PE flexible protective layer 301, a PA support layer 302 and an EVOH gas barrier core layer 303 from the inside to the outside. The PE flexible protective layer 301, PA support layer 302 and EVOH gas barrier core layer 303 are formed in one step by a three-layer co-extrusion process.

[0028] In this embodiment, the PE flexible protective layer 301, PA support layer 302, and EVOH gas barrier core layer 303 are formed in one step through a three-layer co-extrusion process to form the outer protective layer 3. The PE flexible protective layer 301 provides good flexibility and wear resistance, and can resist external friction and scratches, protecting the internal layer structure from damage. The PA support layer 302 enhances the overall strength and stability of the outer protective layer 3, so that the rust-proof bag body 1 can maintain its shape when subjected to external pressure or impact and is not easily deformed. The EVOH gas barrier core layer 303 has excellent gas barrier performance, which can prevent harmful gases such as oxygen and moisture from penetrating into the rust-proof bag body 1, thereby maintaining the stability of the bag's internal environment and providing long-term rust protection for new energy batteries.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vapor phase rust-preventive bag for packaging new energy batteries, comprising a rust-preventive bag body (1), characterized in that: The rust-proof bag body (1) has a multi-layer composite structure, and from the inside out, it includes an inner contact layer (101), a buffer isolation layer (102), a nylon film (103), a VCI vapor phase rust-proof layer (104), and an antistatic shielding layer (105). The outside of the antistatic shielding layer (105) is provided with a heat reflection layer (2), and the heat reflection layer (2) is a vacuum-plated aluminum film. The outermost layer of the rust-proof bag body (1) is provided with an outer protective layer (3), and the outer protective layer (3) is provided from the inside out with a PE flexible protective layer (301), a PA support layer (302), and an EVOH gas barrier core layer (303).

2. The vapor phase rust-preventive bag for new energy battery packaging according to claim 1, characterized in that: The corners of the rust-proof bag body (1) are reinforced by hot pressing.

3. The vapor phase rust-preventive bag for new energy battery packaging according to claim 1, characterized in that: The inner contact layer (101) and the buffer isolation layer (102) are made into a composite film by hot-press co-extrusion process.

4. A vapor phase rust-preventive bag for packaging new energy batteries according to claim 3, characterized in that: A nylon film (103) is provided on the outside of the buffer isolation layer (102), and the buffer isolation layer (102) and the nylon film (103) are combined by a co-extrusion composite process.

5. A vapor phase rust-preventive bag for packaging new energy batteries according to claim 1, characterized in that: The VCI vapor phase rust inhibitor layer (104) is applied to the nylon film (103) by a coating process, and the VCI vapor phase rust inhibitor layer (104) exists in the form of a film and is directly attached to the surface of the nylon film (103).

6. A vapor phase rust-preventive bag for packaging new energy batteries according to claim 3, characterized in that: The inner contact layer (101) is made of a composite material of low-density polyethylene (LDPE) and an anti-blocking agent.

7. A vapor phase rust-preventive bag for packaging new energy batteries according to claim 4, characterized in that: The closed-cell foam material of the buffer isolation layer (102) is cross-linked polyethylene foam, and its surface is treated with plasma to form an antistatic coating.

8. A vapor phase rust-preventive bag for packaging new energy batteries according to claim 1, characterized in that: The PE flexible protective layer (301), PA support layer (302) and EVOH gas barrier core layer (303) are formed in one step through a three-layer co-extrusion process.

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